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cocos2d-X 节点（UIPageView.h）API

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一个翻页视图，里面包含了一些对页面操作的方法

/////cocos2d-x-3.0alpha0/extensions/CocoStudio/GUI/UIWidgets/ScrollWidget
// 一个翻页视图，里面包含了一些对页面操作的方法

#ifndef __UIPAGEVIEW_H__
#define __UIPAGEVIEW_H__

#include "../../Layouts/Layout.h"
#include "UIScrollInterface.h"

NS_CC_EXT_BEGIN

typedef enum
{
    PAGEVIEW_EVENT_TURNING,
}PageViewEventType;

typedef void (Object::*SEL_PageViewEvent)(Object*, PageViewEventType);
#define pagevieweventselector(_SELECTOR)(SEL_PageViewEvent)(&_SELECTOR)

typedef enum {
    PAGEVIEW_TOUCHLEFT,
    PAGEVIEW_TOUCHRIGHT
}PVTouchDir;

class UIPageView : public Layout , public UIScrollInterface
{
    
public:
    /**
     * Default constructor
     */
    UIPageView();
    
    /**
     * Default destructor
     */
    virtual ~UIPageView();
    
    /**
     * Allocates and initializes.
     */
    static UIPageView* create();
    
    /**
     * Add a widget to a page of pageview.              //把 widget 添加到页面视图里面的一个页面
     *
     * @param widget    widget to be added to pageview.
     *
     * @param pageIdx   index of page.
     *
     * @param forceCreate   if force create and there is no page exsit, pageview would create a default page for adding widget.
     */
    void addWidgetToPage(UIWidget* widget, int pageIdx, bool forceCreate);
    
    /**
     * Push back a page to pageview.                    //从页面视图里面回退一个页面
     *
     * @param page    page to be added to pageview.
     */
    void addPage(Layout* page);
    
    /**
     * Inert a page to pageview.                    //在页面视图里面插入一个页面
     *
     * @param page    page to be added to pageview.
     */
    void insertPage(Layout* page, int idx);
    
    /**
     * Remove a page of pageview.               //从页面视图里面移除一个页面
     *
     * @param page    page which will be removed.
     */
    void removePage(Layout* page);
    
    /**
     * Remove a page at index of pageview.              //从页面视图里面移除索引对应的页面
     *
     * @param index    index of page.
     */
    void removePageAtIndex(int index);
    
    /**
     * scroll pageview to index.            //滚动页面视图索引。
     *
     * @param idx    index of page.
     */
    void scrollToPage(int idx);
    
    /**
     * Gets current page index.             //获取当前页的索引
     *
     * @return current page index.
     */
    int getCurPageIndex() const;
    
    // event                                                            //添加事件监听
    void addEventListener(Object *target, SEL_PageViewEvent selector);
    
    //override "removeChild" method of widget.                  覆盖 widget 的 removeChild 方法
    virtual bool removeChild(UIWidget* widget);
    
    //override "removeAllChildrenAndCleanUp" method of widget.
    virtual void removeAllChildren();
    
    //override "onTouchBegan" method of widget.
    virtual bool onTouchBegan(const Point &touchPoint);
    
    //override "onTouchMoved" method of widget.
    virtual void onTouchMoved(const Point &touchPoint);
    
    //override "onTouchEnded" method of widget.
    virtual void onTouchEnded(const Point &touchPoint);
    
    //override "onTouchCancelled" method of widget.
    virtual void onTouchCancelled(const Point &touchPoint);
    
    //override "update" method of widget.           //覆盖 widget 的update 方法
    virtual void update(float dt);
    
    /**
     * Returns the "class name" of widget.          //返回 widget 的名字
     */
    virtual const char* getDescription() const;
protected:
    virtual bool addChild(UIWidget* widget);
    virtual bool init();
    Layout* createPage();
    float getPositionXByIndex(int idx);
    void updateBoundaryPages();
    virtual void handlePressLogic(const Point &touchPoint);
    virtual void handleMoveLogic(const Point &touchPoint);
    virtual void handleReleaseLogic(const Point &touchPoint);
    virtual void interceptTouchEvent(int handleState, UIWidget* sender, const Point &touchPoint);
    virtual void checkChildInfo(int handleState, UIWidget* sender, const Point &touchPoint);
    virtual bool scrollPages(float touchOffset);
    void movePages(float offset);
    void pageTurningEvent();
    void updateChildrenSize();
    void updateChildrenPosition();
    virtual void onSizeChanged();
    
    virtual void setClippingEnabled(bool able){Layout::setClippingEnabled(able);};
protected:
    int _curPageIdx;
    Array* _pages;
    PVTouchDir _touchMoveDir;
    float _touchStartLocation;
    float _touchEndLocation;
    float _touchMoveStartLocation;
    Point _movePagePoint;
    UIWidget* _leftChild;
    UIWidget* _rightChild;
    float _leftBoundary;
    float _rightBoundary;
    bool _isAutoScrolling;
    float _autoScrollDistance;
    float _autoScrollSpeed;
    int _autoScrollDir;
    float _childFocusCancelOffset;
    Object* _eventListener;
    SEL_PageViewEvent _eventSelector;
};

NS_CC_EXT_END

#endif /* defined(__UIPageView__) */